Electrical ignition and fuel supply



Nov. 3, 1942. n w. BEcKET-r ELECTRICAL IGNITION AND FUEL SUPPLY SYSTEI .FOR OIL BURNERS Filed Feb. '5, .i940

4 Sheets-Shed'. 1

, w I ,f NQ A .u ,svg/m5, I 64, QQ, Y n Il n nlnnlulllulmwwn un n* 5 MB h. WW W mmm w .n mw ...I l w w Nn o@ n Nm I R mw ww ,NN wmwk wm Mn, mh. Wh.. l nw n xt l.. o Q95 n *I w\- n "0*2 Nw h vwhq \'.w.. .l w nl N, ,RVS IN. l uumnwmmwmmmmma/h. h Nw me m. kw .mh @NQ v mm .m Nm .l L1 H a n l I '.LI l W u l ,v e, .w um n" n., wm mm WS m3 m N n m QS. Qt S n m QQ 1 N .QS w w NX .Ils

INVENTO vREGINALD w.'BEcKEfrT BY l AAW #le Qi ATTORNEY NUV- 3 1942-l R. w. BECKETT 2,300,903

ELECTRICAL GNITION AND FUEL SUPPLY SYSTEM FOR on.:l BURNERS Filed Feb. 5, 1940 l sneetssnget 2 7014- 3! |NvENToR REGINALD W. BECKETT m4 v )kf ATTORNEYS R. W. BECKETT ELECTRICAL IGNI'IION AND FUEL SUPPLY SYSTEM FOR OIL BURNERS 4 Sheets-Sheet I5 Filed Feb. 5. .1940

INVENTOR REGINALD W@ BECKET'T BY 024.44 f .he

ATTQRNEY Nov. 3, 1942- R w. BECKETT ELECTRICAL IGNITION AND FUEL SUPhPLY SYSTEM FOR ON.: BURNERS Filed Feb. 5, 1940 4 Sheets-Sheet 4 INVENTOR REGINALD W. BECKETT ATTORNEY the burners.

Patented Nov. 3, 1942 EIEC'I'RICAL IGNITION AND FUEL SUPPLY SYSTEM FOR OIL BUBNERS Reginald W. Beckett, Elyria, Ohio Application February 5, 1940, Serial No. 317,244

11 Claims.

This invention relates to oil burners, and more particularly to the construction and arrangement of electrical ignition apparatus and fuel supply means for fuel burners of the character mentioned. This application is a continuation in part of my copending application Serial No. 188,731, filed February 4, 1938.

It is an object of the invention to provide an improved ignition apparatus for oil burners and the like which may readily be removed from or adjusted in the burners, and which is reliable and efilcient in operation.

Another object is to provide an oil burner having an ignitionelectrode assembly that can =be withdrawn from the burner housing while the burner is attached to or installed in a furnace or boiler with a minimum of time and effort.

Another object is to provide an ignition and fuel supply system for an oil burner or the like in which an access opening is provided through which the ignition electrodes can be serviced, and which is arranged to automatically disconnect the ignition electrodes from the electrical current supply means or transformer when the access opening is uncovered.

Another and principal object of the invention is to provide an electrical ignition apparatus for oil burners which will substantially eliminate the human factor in the servicing and installing of This aspect of the invention has particularl reference to elimination of high tension cables for connecting the ignition electrodes to the transformer; the invention aims to eliminate the necessity of the service man manually making, or breaking, or disconnecting electrodes from the transformer when servicing the burner.

Among the features of the presentinvention are: improved conductors between the electrical transformer terminals and the ignition electrodes; an improved mounting for supporting an ignition transformer on the burner housing so that the same may be used as a cover for an access opening; improved contacting elements which automatically disconnect and connect the electrodes from the-transformer terminals when the transformer is moved to open and close the access opening; and improvements in the mounting of the ignition electrodes in combination with the fuel supply conduit so that they may be adjusted longitudinally in the burner during operation of the same.

A still further object of the invention is to provide an ignition system and fuel supply means for oil burners which is simple in design and coner objects and advantages will become apparent from the following detailed description of suitable embodiments oi' the invention made in con-` nection with the accompanying drawings, in

5 which like parts throughout the several views are indicated by the same numerals of reference.

Figure l is a side elevational view, partly in section and with parts removed, showing a burnerl embodying the present invention and contially on the line i--I of Fig. 2;

Fig. 2 is a rear elevational view of the burnerf with parts broken away;

Fig. 3 is a front elevational view of the burner; l5 Fig. 4 is a fragmentary sectional view taken substantially on the line 4 4 of Fig. 1; Fig. 5 is a fragmentary elevational detail showing the side oi' the transformer having the transformer terminals, and illustrating the positions f of the resilient contacting elements secured therel -30 the hinge mounting for the electrical transformer;

Fig. 9 is an enlarged fragmentary detail,- in section, showing one construction of the electrode contacts or terminals; f I

Fig. l0 is a fragmentary elevational view showing a modified construction of the resilient contact elements that connect the electrical transformer and the ignition electrodes;

Fig. l1 is `au elevational view, partly in section. taken substantially on the line ii--ii of Fig. l0; r

' Fig. l2 is a plan view showing the electrode contact elements and the transformer conductors. illustrated in Figs. l0 and l1; and

Fig. 13 is a vertical sectional view showing another modiilcation of the invention as embodied in a burner connectedgto a furnace having a burner recess.

Referring to the drawings by numerals of reference, which indicate like parts throughout the several views, the burner comprises a pedestal or base, indicated generally by the numeral I, which is surmounted by and supports a main body portion or housing, indicated generally by the nustruction, and inexpensive to manufacture. 0th- 55 mei-al 2. A horizontally disposed air or blast tube nected to a furnace. 'I'his view is taken substan- 3 is secured to the lower portion of the housing 2 at one end thereof by cap screws or studs 4 which extend through a radially directed flange il lformed at the inlet end of the air tube. On the upper portion of the housing 2 at the end Vthereof opposite the blast tube 3 a supporting member' or bracket 5 is removably secured by cap screws or studs 6.

The bracket l carries a removable unit which comprises all the movable parts' of the burner including motor 1, fuel lpump and pressure regulator 3, :blower l of the sirocco type, and cover plate Il. The blower I is actuated and supported by shaft I2 of the motor 1 which also actuates the` fuel pump. The circular cover plate ill has a running or clearance flt on the shaft l2 between the motor I and blower 3.

'Ihe blower I is received in a chamber `14 i formed in the upper portion of the housing 2 and forces air downwardly through a throat Il4 The fuel pump and pressure regulating deviceV l draw liquid mei through supply conduit n and fonce it under relatively` high pressure through direction oi rotation of the blower rotor 3, indicated by the arrow oi' Fig. 6.

One side of the inlet end I6 of the passage. opposite the throat i5, is defined by an internal wall or partition 42 which starts substantially at the bottom center of the housing 2 where it is connected to fthe lower part of the bottom wall 33, as indicated at 43, and is then curved upwardly to the left and then to the right in a clockwise direction following the general curvature of the passage I-l as deiined by the tube 3. 'I'he upper end of the partition 42 and the lower end of the partition 3l are'ioined by a short, vertically disposed partition 44 which partially deilnes the throatv Ii. The partition 42 is curved or sloped longitudinally of the inlet portion I 6 of the air passage. This curvature is progressively increased from the lowerportion 43 to the top 'portion where the partition 42 Joingthe vertical partition 44. The margin 4l oi the partition 42, adJacent the end wall 33 of the housing 2, progressively approaches the axis of the air passage i1, while the margin 43 of the partition 42, adjacent the fuel pressure conduit Il having a ilexible loop 23 into fuel pipe 2| supported by bracket 22 and.: spider 23 in the air tube 3. A spray nozzle 23 is secured on the end of the fuel pipe `2i at the discharge end of the air tube 3 so that its outlet oriiico 23 isdispoeed substantially `in the planer endwall 31 of the housing, remains substantially flush with the internal wall of the air tube 3.

frube 3 is substantially circular in cross section throughout its length and has a portion 41 of `cylindrical form and uniform diameter adjacent thehousing 2 which merges into a tapering portion 43 which extends toward the discharge end of tube where a secondcylindrical portion 43 ogvtie smallest cross-sectional area 'portion of al i through the passageway l1`by the blower .l and moving ina helical'path commingles with the oil sprayy emerging from the nozzle orifice 2l to form a mist of nnely dispersed oil particles which ,/bumer head 21. lto bolster described.y Air forced l burn in combustion chamber 23 of a heating unit such as a domestic furnace.

The housing 2 is symmetric in external appearance and of generally ovate form as viewed from either end. It is carried in an upright. position on the base I. being of a materially greater height than width and of a4 materially greater width than length. The housing is of substantially uniform length from top to bottom and has a top walk of generally rounded form merging into relatively straight verticalgside Vwalls 3l and 32. Inwardly curving or rounded bottom walls 33 and 34 extend downwardly as oontinuationsofthe side walls 3| and 32 and terminate ina downwardly directed socket 3l, to be later described. Rear the head 21 in nest of uniform internal diameter and relatively short axial length is formed. The walls ol the tube 3 are relatively thick and ot heavy section at the discharge end thereof,` preferably being in the form of an integral, thick-sectioned, annular collar I0 which reinforces the tube lend and receives the screws which hold the head 21. A circular. radially directediiange Il is integrally formed about thev large diameter end of the head 21 and circumferentially abuts against the annular collar or thickened lsection Il on the discharge end o! the tube 3. A pair of screws 33 extend through suitable drill holes in the flange 53 and are threadedly secured in the collar l0 to clamp exchanging circumferential contact with the collar.

Another pair` ol .screws Il extend through an annularhc1ding'tinglLdisposed about the head 21, through '33 andare threadedly re- 'l lceived' inftheann'ular thickened collar portion 5I! end wail 3l carries the bracket 3 whichsupports the removable motor unit. amzifront end wall 31 carries une air tube 3 as mentionedabove.

The blower chamber i4 mg.' 8) is of the form commonlyl employed with rotary blowersoi the sirocco type having axially extending blades, and is partially defined by a curved internal. wall or partition 33 which extends between the end walls at the 'discharge endoftlie tube 3. The ring ll2 and-.flange "F3 preferably 4have substantially `the same outside diameter and the ring is axially movable over an external cylindrical portion 34 of 21 whichextends forwardly from the y base ofthe ilange i3; .Between the ring 52 and Bange I3, andk seating onl the cylindrical portion ll'of `theghlead,v is an annular ring 5l of fireand 31 of the housing 2 from a point 33 where it is formed into the top wall 30 of the housing at substantially the center thereof downwardly to the left in a circularfashion and thenv to the proof` fmaterial such as asbestos. This ring is clamped between the holding ring -52 and ange by `thescrews 5I which also hold thev i, head 2.1 to the tube 3.

right, as viewed in Fig. 6. The lower end of the I wall 33 extends beyond the middle of the housing The head 21 is formed to present a substantially continuous circular shoulder 56 to the adkvancing air and effects an agitation thereof which is beneficial in forming a suitable combustible and to cubos u of the throat in The radiali? space between the peripheral margin of the rotary blower I and the walls of the chamber I4 pro- .sreaively increasesfrom the coton au ma clockwise direction around the rotational axis oi the -mixture with the fuel oil. 'I'his shoulder 56 is ad- Jacent the small diameter cylindrical portion 49 of .the passageway i1 in which is located the 'spider 23. Fromthe shoulder 5B the head 21 is tapered and the internal walls thereof converge to blower 'substantially to the throat `I'his invcrease `in the free radial cross-sectional area of ',-l the heini-emma for tneuow or air ism the Vprovide a progressively decreasing, substantially circular cross-sectional area in the direction of air ow. At substantially the region of smallest cross-sectional area the head 21 is formed with'v .1l by helical compression springs Il. Each of a shoulder l1 which further turbulatesor agitates the 11h88 l. has One and adjustably Ruined the moving air. From the shoulder i1 to the exon the electrode by a reduced diameter portion treme end of the head 21 there is anoutwardly. j ll which grips the electrode. and a nut 82 which tapering outlet or mouth M. y =5`4 is threaded onto the electrode. The end of each A downwardly sloping passage or drill hole I l of the springs al, opposite the reduced diameter extends through the bottom wall of the head 21 lportion Il, bears against a shoulder formed by from the inside thereof between the annular diameter head portion Il of the sleeve *f shoulders 56 and 51, through a depending vboss y; 1l. Thus the spring Il is partially carried over 60 integral with the head. to the foremost edge 10 the sleeve 1l to have sliding engagement'therev`of the head. This hole serves as a drain for f with andprcvent the individualturns ofthespring fuel oil that may drip from the nomle 2l and .from being caught on the threaded electrodes.

directs the same into the combustion chamber] The springs Il are adjusted so that the heads A 28. Preferably the end of the hole l! inside the Il naturally take the position indicated by the head is enlarged-or dished to more effectively 1s broken linesin Fig. 9, and are moved k'to subdrain of! the oil. stantially the full line position when engagedby The bracket 22 whichholds the fuel pipe l2| the brushes 1l. In thus effecting electrical con- -has a curved or cylindrical bottom surface ll tact for the flow of current through the'electrodes Vwhich corresponds in curvature to the internal yCl and t the brushes are likewise deflected cylindrical surface of the portion I1 of the tube 2q kfrom the broken line position to the full line posif 3. This curved surface t4 assists in aligning the .tion of Pig. 9 and placed under stress. bracket in the air passageway i1 and affords a. The' transformer box 1l has a fiat plate It snug fit between the bracket and tube. which is arranged to cover the opening 'I1 in bracket is held in place by a depending threaded the rear end wall Il of the housing 2'. Piange stud .l which extends through an elongated slot mi. portions l0 and I1 of the plate Il extend beyond 6l formed in the bottom of the'cylindrical por-y the sides vof the box 13 and are utilized in at- .i

tion 41 ofthe air tube I. Preferably, the stud taching the box to the housing.V The flange Il v6I is made separately from the bracket 22 and v has a vertically disposed piano type hinge Il sethreadediy secured therein; Accordingly. the cured thereto by suitable means such as 'spot bracket 22 may be adjusted longitudinally in the "30 welding.l The upper portion of this hinge is tube! soas to varythepositionofthenoaale 2l jv seated in a recessed portion of the housing wall with respect to the head 21. A nut l1 on the Il (Fig. 8) and is secured thereto byilat head stud locks the bracket in adjusted position and machine screw. II. The lower portion of the. the novel shape of the tube 3 which provides a hinge is similarly secured to an ear (Fig. 3) L cylindrical portion for holding the bracket 22 Sii-,extending from the housing 2.

i' v retains the fuel pipe 2| centered in the air pas The danse-l1 of the plate Il is secured to the` 'i sageway I1 in all positions of'adjustment. The .housing 2 and an ear il byfillister head screws "w cylindrical portion Il at the discharge end of the .l2 (Pig. 1). This novel mounting of the transe air tube which has a uniform internal diameter. former facilities opening of the inlet end of the permits the spider .23 to move longitudinally in `fircombustiorji air passageway so that adjustment 1 :the passageway i1 while the ends of the spiderf legs maintain sliding engagement with the walls of the tube. Thus both ends of the fuel oil pipe :5 unique' contact arrangement of the high tension 2i are supported and retained centrally in the -r velectrical conductors for the electrodes il and Il air passageway i1 regardless of the movement `.elixninlttesthe use of loose high tension wires, of the bracket 22 and spider 2! Vin adjusting the thus rendering the burner safer and less likely to nozzle 25. 1 1 1- r get out of order. Each time the transformer A pair of ignition electrodes l and II are dis- V-lwx Il is pivoted on the hinge Il to uncover the f posed longitudinally through the passageway i1 slightly above and on opposite sides of the oilA ,pipe 2l. These electrodes are mounted in lpor celain insulators 10 held in a clamp 1i on'th top of uieabrseket zz. vThe forward ends of the electrodes Bt and 89 are directed towardlon gjanother in the region of the orifice. -of ythe J- --noazle 25 so .that a spark across matically opened. when the transformer box Ilia pivoted to the closed positionA to cover the opening .11 the ignition connections'to the tips through -a downwardlydirected inlet opening in a 'hood M formed on thefront wal1`31 of the hcusing 2.2' An' air chamber Il in the hood I4 V against the rear Vend wall ofthe housing, fur-fV with the blower chamber M mshes high tension current to the' electrodes il' f f through a circular opening formed in the front and Il.. Conductors'or terminals 14 and 1l en-A' "wall l1 and concentric with the shaft i2 of the closed by insulators 1t extend into the inlet end. blower and motor. a

of the air passageway l1 fromme-transformer? An air gate l1. isimounted of! center on rebox A:.13 through-an openingf." Vforward "in 'the 11061 \1l'-lf1i'!' Di!! 611GB Il (Hg- 4) 0f adjustable pivot vscrews whichare threadedly carried in the atomized fuel. I if. transformer, carried ina bom-13118D0806 thattheymay'beadjustably'screwed toward or 1 #and at right angles across the axes el trodes il and l. Y

---.Electrical contact is made `b .r

1l andthe electrodes by means'ofro'eaiact sleeves. Y

* 1I (Fig. 9') slidably received ontlsethneaded ends; oni-.the pin ends Il of the-pivotv screws. y

' f of the electrodes and urged towaldathhrushesifs .orremoval ofthe nozzle and electrodes may be '2: made through the rear wall of the burner. The f opening 11. the secondary or high'voltage con- .,nections to the electrodes il and Il are auto-v ofelectrodes il and Il are automatically closed. Air is drawn into the burner by the blower 9 hligned holes throughthe side walls of the hood .-iflfl'hef screws Il preferably have enlargedl knurledheads on the outside of the hood M so s awayfrom one another and shoulders thereof` may faire made Ato :nationally engage .apertured e pivotbracketsl Il! 'which to the air." gate-.l1 to support the sameand'are received ani adjusting m 'isverucauydisperser` the air chamber 95 and rotatably journaled in a drilled hole in the top of the hood"94. An enlarged knurled head |05 is secured on the top of the rod |04 above the hood 94 so that the rod can be manually rotated. An indexing pin |06 extends through the rod |04 and extends radially therefrom The rod |04 is urged downwardly by a helical compression spring |08 which seats on a washer |09 secured on the rod |04 and a washer bearing upwardly against the inside of the top wall of the hood 94. A foot is formed at the bottom of the rod |04 by bending the latter substantially through 90. This foot is disposed a short distance above the air gate 91 when the latter is closed and it is preferably provided wih a rubber covering ||2 to silence the contact between the foot and the gate when the movement of the latter is arrested by the foot. When the pivot screws 99 are loosened so that the air gate 91 is free to pivot on the pins 98, the gate is opened by the air pressure on the underside thereof when the blower 9 is rotating. The amount that the air gate will open under the influence of air pressure can be varied or adjusted by rotation of the rod |04 which moves the foot to various positions. By means of the rod |04 the opening of the gate 91 which regulates the quantity of air forced through the passageway |1 by the blower 9 can be adjusted while the burner is in operation to give the most eilicient and desirable type of flame in the combustion chamber 28. The frictional effects of the pin |06 and spring |06 are adequate to temporarily hold the rod |04 while adjustment of the burner is being made. After the adjustment is complete the rod |04 is locked in position by set screw ||4. As long as the blower 9 is in operation the gate 91 is held open against the foot of the adjusting rod |04. Upon shutting oi! the burner so that the blower 9 stops, the air gate 91 drops by gravity to the closed position illustrated in Fig. 1. Downward pivotal movement of the gate 91 is limited by a suitable stop I|3 or by engagement of the edges thereof which are parallel to the axis of the pivot screws 99 with the inside bottom edge of the wall of the hood 94 or the end wall 31 of the housing 2.

The movable parts of the burner are carried by a. substantially U-shaped cradle secured to the floor of the supporting member or bracket 5 by studs ||6 and centered thereon by raised tracks or bosses ||1 (Fig. 2). The upstanding arms of the cradle ||5 are provided with metal bands ||9 which confine annular rubber rings or cushions (not shown) embracing the journal bosses on the bells of the motor 1. Accordingly, the motor, blower and pump are resiliently cushioned and the single rotating shaft is supported intermediate its ends at a plurality of points by rubber cushioned journals.

An upright portion |9 of the supporting member 5 is disposed against the upper portion of the rear wall 36 of the housing 2 and a circular opening is formed through the portion ||9 and the wall 36 to permit passage of the blower 9 when removing or replacing the movable parts or motor drive unit. This opening is closed by the cover plate |0 which is secured to the portion ||9 of the bracket 5 by screws |2| (Fig. 2).

The pedestal or base has a relatively large footing portion |24 which affords a wide area support for the burner. Square or rectangular pads or cushions |33 are received in sockets |39 at marginal portions of the footing portion |24 of the base. Preferably, the pads |33 are three `in number and formed of resilient cushioning or vibration-absorbing material such as wood, cork, or rubber, thus effecting a quieting three point mounting for the burner. In the event that the surface on which the burner is to be supported is irregular or of uneven height, the pads |33 can be made shorter or longer, as required, so as to carry the base evenly and firmly. Upwardly directed wall portions 25 formed integrally at the central portion of the front end of the base are surmounted by a substantially horizontally disposed platform portion |26. This platform is thus disposed a material distance above the surface on which the footing portion |24 of the base rests. A vibration absorbing block |21 formed of suitable material such as wood or cork is carried on the platform portion |26 and is surmounted by the housing 2. Preferably the block |21 fits into the socket 35 formed in the bottom of the housing so that the top sides of the block are embraced by depending portions |26 of the socket. Similarly, the upwardly directed walls |25 of the base extend above the level of the platform |26 to embrace the bottom sides of the block |21.

In plan form the block |21 is non-circular in shape, preferably being square or rectangular. The depending portions |29 of the socket 35 are formed to a corresponding shape as are also the upwardly projecting portions of the walls |25 of the base so that when the block |21 is properly seated on the platform |26 and in the socket 35 the burner housing 2 is correctly aligned with respect to the base A stud |29 is secured in the central portion of the socket 35 and extends downwardly through an aperture in the center of the block |21 and has a loose fit in the central hole formed in the platform |26. The parts are drawn together by a nut |30 which forces a washer |3| of a material having the capacity to deaden vibrations. such as lead, upwardly against the bottom of the platform portion |26.

In Figs. 10 through 12 is illustrated a modification of the invention in which electrical connections between the ignition electrodes 68 and 69 and the terminals or conductors 14 and 15 of the electrical transformer 13 is made by depending spring contacts |96. These contact elements or springs are angularly disposed with respect to the electrodes and may be formed of any suitable resilient material having the necessary electrical conductivity properties, such for example, as brass or bronze. Tubular ends |91 of the elements |96 are received on the ends of the electrode bars 68 and 69 and are secured in place by nuts |98 threaded on the ends of the electrode bars, so as to press the tubular portions |91 of the contact elements against tubular spacers |99 on the electrode bars between the contact elements |96 and the porcelain insulators 10. If desired, pins 200 may be passed through suitable aligned apertures in the tubular portions |91 of the contact elements and the electrode bars 68 and 69 to resist turning of the contact elements on the bars.

Secured to the transformer terminals 14 and 15 are brass or bronze conductor bars or connectors 20| which extend or project from the transformer in parallel relation to one another so that when the transformer vcasing or box 13 is disposed across the opening 11 in the burner.

housing 2,v the conductors 20| are disposed in the portion |6 of the air passage |1 formed in the Iower part of the housing. If desired, the

conductor bars 20| may be L-shaped, as illustrated in Fig. 12, so that they are spaced apart a distance substantially equal to the spacing of the electrode bars 68 and 69. When thus formed, the conductors 20| may be secured to the terminals 14 and 15 of the transformer by means of screws 202; if desired, the conductors may be threaded and screwed directly into the transformer terminals.

This modification of the invention provides an arrangement which automatically disconnects the transformer from the ignition electrodes when the transformer is displaced or pivoted away from the opening 11 in the burner housing in the manner previously described. When the burner is pivoted on the hinge 88 to close the opening 11, the conductor bars 20| move from the broken line position to the full line position, indicated in Fig. 12, over arcuate paths, thus automatically establishing an electrical connection between the transformer terminals and the ignition electrodes 60 and 69 as soon as the spring contacts |96 are engaged.` The resilient contacts or elements |96 are initially engaged by the conductor bars 20| before the transformer casing. is in its final 'position closing the opening 11. Accordingly, during the closing of the opening by the transformer, the contact elements |96 are displaced from approximately the broken line position, illustrated in Fig. 1l, to the full line position of that gure. Thus, the electrical contact or connection between each of the conductor bars 20| and the elements |96 is maintained by the resiliency of the latter. The pivotal movement of the conductor bars 20| about the axis of the hinge 08, which is offset to one side of the electrodes 68 and 69, allows one of the conductor bars to swing between the elements |96 during the closing of the transformer casing across the opening 11.

In Fig. 13 is illustrated a modified construction of the burner which is designed for use in connection with a furnace or heater having a recess or pocket |40 to accommodate the burner. Furnaces of this character are usually constructed of steel or iron and the pocket may be.

of the combustion air passage |1 is materiaily shortened so that the mouth 50 of the head'is relatively close to the inlet end |6 of the passage. Desirably, the burner may be provided with an integral head and air or blast tube |50 which projects through an opening |54 in the rear wall |4l of the pocket. The head |53 is provided with a nange |55 corresponding to the nange previously described and which is disposed against the front end wall 31 of the burner housing 2, being secured thereto by studs |55. The head |53 is frusto conical in shape, converging toward the mouth 58 thereof and eecting a seal with formed of a single casting having integral rear,

side, top and bottom walls |4|, |42, |43, and |44, respectively. The burner is provided with a base |45 similar to the basel previously described and which rests on the bottom wall |44, the latter inclining upwardly toward the rear wall |4| of the pocket |40. A horizontally disposed track |46 is positioned over the bottom wall |44 of the pocket and supports and guides the burner when the latter is slid into or out of the pocket. A depending leg portion |41 of the track |46 extends downwardly across the front marginal edge of the bottom wall |44 and is secured by a stud |48 which extends through a flange on the bottom wall and into an upwardly directed nange formed on the margin of base |49 of the furnace. The base |45 is formed with longitudinally extending bearing portions |50 which have sliding engagement with the top and sides of the track |46 at marginal edge portions so that the burner is wholly supported by the track and guided for straight line movement. Upon withdrawing the burner from the pocket |40 a depending apron |52 formed along the rear edge of the base serves as a support for the burner when the center of gravity thereof moves beyond the end of the track |46.

In order that the burner may be substantially wholly received within the pocket |40, the length insulating material |51 disposed in a plurality of layers between the rear wall |4| of the pocket |40 and refractory lining |50 of the furnace combustion chamber |591 The fuel pipe 2| is supported in the head |59 by the spider 23 having sliding engagement with cylindrical portion |60 of the passage formed internally therein and which corresponds to the cylindrical portion 49 previously described. A bracket |62 positioned within the inlet end |5 of the air passageway |1 carries the fuel pipe 2| and electrodes 60 and 69 in a manner similar to the Abracket 22 previously described. A horizontally disposed foot portion |63 of the bracket |62 rests on the floor of the inlet portion i5 o! the air passage in the lower part of the housing 2 and has an elongated slot |64 received on the upwardly extending end of a securing bolt |65. This bolt extends upwardly through the platform portion |26 of the base |45 supporting block |21, and is threadedly secured in the bottom of the housing 2. The upwardly extending end of the bolt |65 is in the nature of a stud which receives a tightening nut to lock the bracket |62 in adjusted position. Additional holding bolts |66 extend upwardly between the platform portion |25 of the base and housing 2 through the block |21 being threadedly secured inthe housing to reinforce the connection between the base and housing. The lead washers |I| are employed as previously described to deaden the transmission of vibrations from the housing to the base.

The electrical connections between the conductors 14 and 15, leading from the transformer. and electrodes 60 and 69, are effected by spring brushes |51 formed of suitable material such as bronze or brass and having a reversey bend |60 to impart increased resiliency thereto. These brushes are secured by screws |66 to the conductors 14 and 15 and extend upwardly across the axes of the electrodes 65 and 69.-

The adjusting rod |04 for the air gate 91 has secured on its upper end above the hood 94 a cylindrical head |10 which has a transverse screwdriver slot |12 formed across its upper end so that adjustment of the air gate may be effected without reaching ones hand into the head |10 which is relatively close to the hot walls |4| and |43 of the furnace pocket. The spring Ill is made or sumcient strength so that the friction of the indexing pin |05 and washers |09 and ||0 is suflicient to prevent inadvertent movement of the adjusting rod |04. A rubber covered pin |03 secured in the front wall of the hood 94 at the bottom inside edge thereof, limits downward pivotal movement of the air gate 91.

Desirably the burner as illustrated in Figure 13 I is secured in place within the pocket |40 by screws |10 which extend through the base |45 and are threaded into the bottom wall |44 of the pocket. These screws prevent sliding movement of the base on the track |46 and resist lateral tipping and vibration of the burner, Other parts of the burner which correspond to parts previously described have been indicated by the same numerals of reference.

The unique design of the burner housing 2 provides a wiring box |14 between the outside walls of the housing and the internal partitions 38 and 42. A removable plate or plates |8| held in place by a screw or screws |15 secured in a boss |16 formed on the partition wall 38 close the opening in the side wall 3| leading into the terminal or wiring box |14, Thus but a single electrical conduit |11 leads to the burner and enters the wiring box |14 through a fitting |14 in the removable side wall plate Il. The power leads |19 to the transformer extend through agis' cored hole |80 in the rear wall 34 of the housing and the power leads |82 to the motor 1 pass through a cored hole |42 extending through both the rear wall 36 of the housing and the upright portion Il! of the bracket 5. Accordingly, the wiring leads for the burner are substantially concealed and protected from injury. During the opening or closing of the aperture 11 of the housing 2 by the pivoting movement of the transformer casing 1l, the primary leads |19 to the transformer movethrough the hole |80, there being sumcient slack provided in the leads |10 within the wiring box |14 to permit this movement. As shown in Fig. 3, the hole l" is covered by the transformer box 1l when the burner is in 3o operation.

The fuel pressure conduit I8 extends through a slot |84 formed in the rear wall 38 of the housing and which is formed radially from the opening 11. box 13 is pivoted to open position, the conduit I9 may be readily removed longitudinally through the passage I1 and out the opening 11 merely by sliding it out of the slot |84. Preferably a rubber grommet (not shown) fits around the conduit I8 d0 in the slot |44 to prevent the flow of air therethrough and wear of the conduit on the walls of the slot.

By the use of the present invention, an ignition Accordingly, when the transformer of the electrodes and fuel conduit can be effected while the burner is in operation.

The principles of the present invention may be incorporated in various structures, the embodiments shown in the drawings and described above being given merely for purposes of explanation and illustration, it being understood that numerous modifications are contemplated and intended to be included within the scope of the appended claims.

What I claim is:

1. In an oil burner or the like having an elongated electrode, a contact slidingly mounted in telescopic embracing on one end of the electrode, a transformer for furnishing electrical ignition current and means supporting the same adjacent said electrode end, terminal means carried by the transformer, and a spring embracing the electrode and having connection with the contact to normally press the latter and slide the contact along the electrode and yieldingly against the terminal means to provide a path for electric current from the transformer to the electrode.

2. In an oil burner or the like having structure dening a passage for combustion air and an ignition electrode supported rigidly in the passage and provided with a free rod-like end, means defining an opening into the passage, a transformer for supplying electric ignition current and having a terminal, means for mounting the transformer across the opening with the terminal normally extending into the latter in predetermined position and for facile removal of the transformer from the opening. a tubular contact slidably mounted on said rod-like end of the electrode, andi resilient means embracing the electrode and the contact for yieldingly holding the contact against the transformer terminal to provide a path for electric current from the transformer to the electrode.

3. In an oil burner or the like, a housing formed to provide a passage for combustion air, ignition electrodes supported in the passage,

system may be provided for oil burners and the meal-1 den Bn Opening in the housing comlike which embodies numerous advantageous features that improve the operating characteristics of the burners, and which permits servicing and adjustment of the burners with a minimum of trouble and without danger to the service man.

connections between the transformer terminals and electrodes being arranged to automatically separate when the transformer housing or casing is removed from the access opening. Thus the structure of the present invention eliminates the human factorl in the servicing of burners with respect to the making. and breaking of the electrical contacts between the transformer terminais and the ignition electrodes. The elimination of a flexible high tension cable is important because such cables are subject to injury caused by repeated bending or deflection and to the deleterious effects of moisture and oil.

The constructions supporting the ignition electrodes and fuel conduits in the air tubes and burner heads of the different embodiments of the invention permit the electrodes and fuel conduits to be readily adjusted without removal of the burner from the furnace, and in the case of the burner illustrated in Fig. l, the'adjustment 75 municating with said passage, a transformer having high tension terminals, means pivotally mounting the transformer on the housing to swing horizontally to an operative position across said opening to close the same and in which the terminals extend through said opening and automatically make contact with the electrodes within the passage, and electrical conductor means having connection with the transformerto supply electric current thereto.

4. In an oil burner or the like, a housing formed to provide a passage for combustion air, ignition electrodes supported in the passage, means defining an opening in the housing communicating with said passage, a transformer having high tension terminals, means pivotally mounting the transformer' on the housing to swing to an operative position across said opening to close the same, means providing a second opening in the housing adjacent the pivotal axis of the transformer and located so as to be covered by the transformer in operative position, means connecting the transformer terminals and the electrodes through said first n amed opening, and a flexible conductor connected to the transformer and extending through said second opening for connection within the housing to a source of electric current.

5. In apparatus of the character described, housing means providing an air chamber and an and disassembly of the apparatus whereby in assembling the transformer with the housing means the conductors are projected through said opening into the housing and electrical connection between the conductors and the electrodes is *automatically effected within the chamber, said nresilient connecting means permitting movement lofthe electrode and fuel supply unit relative to .the transformer conductors in adjusting said unit while maintaining said electrical connectionbetween the electrodes and the conductors.

6. In apparatus of the character described, a

housing structure defining a passage for combustion supporting air, ignition electrodes and 8. In apparatus of the character described, housing and tube means providing an elongated air passage having an axial opening into one end thereof and a dischargeoutlet at the other end thereof, a fuel conduit andelectrode means disposed in the air passage, adjustable means having connection with said first named means for removably supporting the conduit and electrode means as a unit in the passage, a transformer for supplying electric ignition current and means pivotally mounting the same on said first named means to swing horizontally to and from a position across said opening in which the transformer constitutes a closure for the opening, conductor means on the transformer and projecting therefromV so as to extend through the opening and into said air passage when the transformer is in said position, and separable contactmeans on the electrode means andthe conductor means adapted to automatically make an electrical connection therebetween when the transformer is moved to said position and to automatically interfuel supply conduit means, means having connection with the structure for supporting the electrodes and the fuel supply conduit means as a unit in the passage for longitudinal adjustment, said structure having anopening through which the electrodes with the fuel supply conduit means and the supporting means are removable as a unit from the passage, an electrical transformer disposed across said opening to normally close the same, means securing the transformer to the rupt such electrical connection when the transformer is swung away from said position, whereby facile axial adjustment or removal of said lunit can be effected through said opening.

9. In apparatus of the character described, housing and tube means providing an elongated air passage having an axial opening into one end 'thereof and a discharge outlet at the other end thereof, a fuel conduit and electrode means disposed in the air passage, adjustable means having connection with said rst named means for removably supporting the conduit and electrode structure in predetermined position and for facile removal therefrom to permit separate removal or adjustment of the unit, and separable cooperating contact means carried by the electrodes and the transformer and adapted automatically to interrupt electrical 'connection between the transformer and the electrodes upon removal of the transformer and to make such electrical connection through said opening upon replacement of the transformer in said position, said contact means including a pair of elements one of which is yielding and resilient to compensate .for substantial relative movement of the other v element of the pair upon longitudinal adjustyment of the electrodes in the passage and to retain said electrical connection in all positions of adjustment of the unit.

7. In apparatus of the character described, housing means providing an air chamber and an opening into the chamber, ignition electrodes and means supporting the same in the chamber, an electrical transformer and 'means mounting I the same on the housing means for swinging movement about a substantially vertical axis to and from a predetermined position across said opening, said transformer constituting a closure for the opening when in said position and uncovering the opening when moved away therefrom to permit adjustment or removal of the electrodes through the opening while the transformer remains mounted on the housing means,

contacts projecting from one side of the transformer so as to be swung through said opening `Tand into the air chamber upon movement of the transformer to said position, and yielding means for effectinglelectrical contact between the electrodes and said contacts only when the latter are through the opening and inthe chamber.

extend through the opening and into said airI passage when the closure is in said position, and separable contact means on the electrode means and the conductor means adapted to automatically make an electrical connection therebetween when the closure vis moved to said position and to automatically interrupt such electrical connection when the closure is swung away from said position, whereby facile axial adjustment or removal ofA vsaid unit can be effected through said opening.

10. In apparatusof the character described, housing means providing an air chamber and an opening into the chamber, ignition electrodes and means having connection with the housing means for supporting the electrodes in the chamber, partition means within said housing means providing a wiring box separated from said air chamber, a transformer having primary end secondary circuits for supplying electric ignition current removably mounted on the housing means over said opening and constituting a closure for said opening, conductor means on the transformer connected to the secondary circuit thereof and extending into the chamber through said opening, separable contact means on the electrodes and the conductor means adapted automatically to make an electrical connection therebetween and within the air chamber when the transformer is mounted on the housing means (and automatically to interrupt such electrical connection when the transformer is removed primary circuit and extending therefrom directly through the housing means in a locus of the latter normally covered by the mounted trans former and directly intr.:r the wiring box for connectlon in the latter to a suitable source of elec'- tric power, whereby the transformer can b e readily removed from the opening for inspection of the supported electrodes and whereby said flexible conductor means is wholly concealed and protected by the mounted transformer and is separated from the air chamber containing the electrodes by said partition means. g"

1l. In apparatus ot the character described. housing means providing an air chamber and an opening into the chamber, ignition electrodes and means having connection with the housing means for supporting the electrodes in the chamber, partition means within said housing means providing a wiring box separated from said air chamber, a transformer having primary and secondary circuits for supplying electric ignition current removably mounted on the housing means over said opening and constituting a closure for said opening, conductor means on the transformer connected to the secondary circuit thereof and extending into the chamber through said opening, separable contact means von the electrodes and the conductor means adapted automatically to make electrical connection therebetween and within the air chamber when the transformer is mounted on the housing means and automatically to interrupt such electrical connection when the transformer is removed from the housing means, and electrical conductor means connected to the transformer primary circuit and extending therefrom into the housing means in a locus of the latter normally covered by the mounted transformer and into the wiring box for connection in the latter to a source of electric power, whereby the transformer can be readily removed from the opening for inspection or removal therethrough of the electrodes and whereby said conductor means is wholly concealed and protected by the mounted transformer and is separated from the air chamber containing the electrodes by said partition REGINALD W. BECKETT. 

